lQ
This datasheet is applicable to all revision 1 chips
SYNC/LP
VSS
DETECT
SNS7K
SNS7
QT1081
8-K
EY
QT
OUCH
™ S
ENSOR
IC
The QT1081 is an improved, lower cost, simplified circuit version of the
popular QT1080 sensor IC. The QT1081 is designed for low cost
appliance, mobile, and consumer electronics applications.
QTouch™ technology is a type of patented charge-transfer sensing
method well known for its robust, stable, EMC-resistant characteristics.
It is the only all-digital capacitive sensing technology in the market
today. This technology has over a decade of applications experience
spanning thousands of designs.
QTouch circuits are renowned for simplicity, reliability, ease of design,
and cost effectiveness.
QTouch™ sensors employ a single reference capacitor tied to two pins
of the chip for each sensing key; a signal trace leads from one of the
pins to the sensing electrode which forms the key. The sensing
electrode can be a simple solid shape such as a rectangle or circle. An
LED can be placed near or inside the solid circle for illumination.
The key electrodes can be designed into a conventional printed circuit
board (PCB) or flexible printed circuit board (FPCB) as a copper
pattern, or as printed conductive ink.
The QT1081 is also compatible with clear films to make simple
button-style touch screens over LCD displays.
OUT_0 25
OUT_1 26
OUT_2 27
OUT_3 28
OUT_4 29
OUT_5 30
OUT_6 31
OUT_7 32
24 23 22 21 20 19 18 17
16 SNS5
15 SNS4K
14 SNS4
13 SNS3K
12 SNS3
11 SNS2K
10 SNS2
6
SNS0
7
SNS0K
9
8
SNS1
SN1K
QT1081
32-QFN
1
SS
2 3 4 5
/RST
VDD
OSC
N/C
AT A GLANCE
Number of keys:
Technology:
Key outline sizes:
Key spacings:
Electrode design:
Layers required:
Substrates:
Electrode materials:
Panel materials:
Adjacent Metal:
Panel thickness:
Key sensitivity:
Outputs:
Moisture tolerance:
Power:
Package:
Signal processing:
Applications:
Patents:
1 to 8
Patented spread-spectrum charge-transfer (one-per-key mode)
5mm x 5mm or larger (panel thickness dependent); widely different sizes and shapes possible
6mm or wider, center to center (panel thickness, human factors dependent)
Single solid or ring shaped electrodes; wide variety of possible layouts
One layer substrate; electrodes and components can be on same side
FR-4, low cost CEM-1 or FR-2 PCB materials; polyamide FPCB; PET films, glass
Copper, silver, carbon, ITO, Orgacon
†
ink (virtually anything electrically conductive)
Plastic, glass, composites, painted surfaces (low particle density metallic paints possible)
Compatible with grounded metal immediately next to keys
Up to 50mm glass, 20mm plastic (key size dependent)
Settable via change in reference capacitor (Cs) value
Parallel discrete output, one-per-key, active-high
Good
2.8V ~ 5.0V, <15µA (8 keys at 2.8V, 340ms Low Power mode).
32-pin 5 x 5mm QFN RoHS compliant
Self-calibration, auto drift compensation, noise filtering, patented Adjacent Key Suppression
TM
Portable devices, domestic appliances and A/V gear, PC peripherals, office equipment
AKS™
(patented Adjacent Key Suppression)
QTouch™
(patented Charge-transfer method)
†
Orgacon is a registered trademark of Agfa-Gevaert N.V
AVAILABLE OPTION
T
A
32-QFN
-40
o
C to +85
o
C
QT1081-ISG
LQ
Copyright © 2006-2007 QRG Ltd
QT1081_1R0.04_0307
SNS6K
SNS6
SNS5K